Banca de DEFESA: REBECA TAÍNES DO NASCIMENTO PINHEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : REBECA TAÍNES DO NASCIMENTO PINHEIRO
DATA : 29/08/2019
HORA: 14:00
LOCAL: Museu de ciências morfológicas
TÍTULO:

HISTOMORPHOLOGICAL STUDY  OF THE DIGESTIVE TRACT OF MANATEES Trichechus manatus  LINNAEUS, 1758

PALAVRAS-CHAVES:

Sirenians, digestive system, alimentary habit, histology.

PÁGINAS: 70
GRANDE ÁREA: Ciências Biológicas
ÁREA: Morfologia
RESUMO:

Morphological studies of the digestive tract are relevant for the knowledge of biology and understanding of dietary habits in order to increase conservation efforts of the species. This study aimed to analyze macro and microscopically the digestive tract of the Antillean manatee (Trichechus manatus). Samples were collected from 20 animals that dead stranded in the northeast coast of Brazil and died during the rehabilitation process in captivity between July of 1995 to March of 2017. The macroscopic analysis of the gastrointestinal tract was performed from the follow-up in loco of necropsies of Projeto Cetáceos da Costa Branca (PCCB-UERN). In order to evaluate microscopically, tissues collected during necropsies were fixed with 10% formalin and submitted to routine histological processing, with cuts of 5 μm of tickness, and subsequently submitted to the Hematoxylin-Eosin staining method (H.E.), Verhoeff methodology with ferric hematoxylin and periodic-Schiff acid (PAS) methodology. In the esophagus, the esophageal glands in the submucosa are absent and there are elastic fibers between the muscularis externa and adventicia. The stomach has a structure called cardiac gland, which microscopically, presents ontogenetics differencies. In the duodenal ampulla and diverticula, duodenal glands were identified in the submucosa. In the luminal portion of the mucosa layer of the cecal ampulla, colon and retus, stratified keratinized squamous epithelium was observed. Macroscopically, neonates and adults present the same structures in the digestive tract. The digestive tract of the Antillean manatee of the espécies Trichechus manatus resemble what has been reported about animals from the Order Sirenia, but presenting some histological particularities in more evidence.

MEMBROS DA BANCA:
Externo à Instituição - FLAVIO JOSE DE LIMA SILVA - UERN
Interno - 2859541 - PEDRO PAULO DE ANDRADE SANTOS
Presidente - 1672446 - SIMONE ALMEIDA GAVILAN